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RUNNING FIX

RUNNING FIX. K STEPNITZ 3-12-2011. DETERMINE A FIXED LIGHT OR OBJECT TO USE. DETERMINE A FIXED LIGHT OR OBJECT TO USE. TAKE A BEARING AT A SPECIFIC TIME AND CONVERT THIS TO TRUE. DRAW THIS LINE ON YOUR CHART. BE SURE TO RECORD THE TIME. 1000. DRAW A “DR” LINE ON YOUR CHART.

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RUNNING FIX

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  1. RUNNING FIX K STEPNITZ 3-12-2011

  2. DETERMINE A FIXED LIGHT OR OBJECT TO USE.

  3. DETERMINE A FIXED LIGHT OR OBJECT TO USE. TAKE A BEARING AT A SPECIFIC TIME AND CONVERT THIS TO TRUE.

  4. DRAW THIS LINE ON YOUR CHART. BE SURE TO RECORD THE TIME. 1000

  5. DRAW A “DR” LINE ON YOUR CHART. THIS LINE STARTS ANYWHERE ALONG YOUR BEARING LINE. WE WILL SEE WHY THE ACTUAL LOCATION IS NOT IMPORTANT AT THE END OF THE PROBLEM. DR LINE 1000

  6. AFTER A PERIOD OF TIME, TAKE A SECOND BEARING TO THE SAME MARK. DRAW THIS LINE ON YOUR CHART. BE SURE TO RECORD THE TIME. DR LINE 1045 1000

  7. USE DStreet TO CALCULATE THE “DR” POSITION. USE THE ELAPSED TIME BETWEEN THE TWO BEARINGS FOR “T”. In this case 45 min or 0.75 hr. USE THE BOAT SPEED FOR “S”. D = S*T DR LINE 1045 1000

  8. USE THE PARALLEL RULES TO WALK OR “ADVANCE” THE ORIGINAL BEARING LINE TO THE DR POSITION. DR LINE 1045 1000

  9. YOUR ACTUAL LOCATION AT THE TIME OF THE SECOND FIX IS WHERE THE ADVANCED FIRST BEARING LINE INTERSECTS THE SECOND BEARING LINE. DR LINE 1045 1000

  10. NOTE THAT NO MATTER WHERE WE DRAW THE DR LINE THE RESULTS ARE THE SAME. DR LINE 1045 1000

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